Miter-joint manufacture



Aug. 11, 1925. 1,548,950

F. KUSTERLE MITER JOINT MANUFACTURE Filed June. 25, 1923 2 h etsh et 1 72E?" flail/5' .g z i erle Aug. 11, 1925.

F. KUSTERLE 1mm; JOINT MANUFACTURE Filed June 25, ,1925

2 Sheets-Sheet 2 Patented Aug. 11, 122

trip rat TE '5" Q EEC E To SIMMONS COMPANSL,

DELAWARE.

MITER-JOINT MANUFACTURE/E.

Application filed June 25, 1923.

1 all whom it may concern:

Be it known that I, FRANK KUs'rnnLn, a citizen of the United States, residing at Kenosha, in the county of Kenosha and State of Visconsin, have invented certain new and useful Improvements in Miter-Joint Manufacture, of which the following is a specification.

My invention relates to improvements in miter ji manufacture and, although capable of varied application, is particularly suitable for making skeleton frames constructed of metallic tubing.

Hitherto, so far as I am aware, it has been the custom to cut off, in two separate opera tions at the required angle, the ends of the members which are to be mitered together.

This necessitates extremely accurate work in order to insure that the parts when subsequently joined together, will assume the proper angular relation to each other and will lie in the same plans. These difficulties are still more pronounced when the parts are to be joined together at an angle other than 90.

The principal objects of my invention are to provide an lmproved process'of making miter joints involving a minimum number of operations;-to provide a'process and apparatus of the class described in which extreme accuracy and skill is no longer essential; to provide an apparatus of the class described which shall be simple and economical to make, operate and maintain, and in general to provide an improved process and apparatus of the character referred to.

In the drawings which show my invention as applied in the manufacture of mirror frames constructed of lengths of metal'tub s,

Fig. 1 is a side elevation of the apparatus employed, certain parts. being shown in section,

Fig. 2 is an enlarged fragmentary plan view of the apparatus shown in Fig. 1.

Fig. 3 is a section taken on the line 33- of Fig. 2.

Fig. 4 is a section taken on of Fig. 2, and

Fig. 5 is an elevation of the mirror frame, certain members of which are to be mitered together by the use of my improved process and apparatus.

Referring to the drawings, it will be ob served that the mirror frame shown in Fig.

the line d-et Serial No. 647,457.

The jig part of the apparatus is mounted upon a standard or floor bracket 16 and the saw part of the apparatus is preferably mounted upon suitable floor brackets or pedestals as indicated at 17. The drive shaft 18, which is constantly rotated by any suitable source of power, is supported in suitablebearings as at 19 and on said bearing 19 and coaxial with the shaft 18 there is pivotally mounted an upstanding frame 20, the upper end of which is fitted with suitable bearings 21 in which the saw shaft 22 rotates. Said saw shaft 22 which is parallel with shaft 18 is driven by a pulley 23-keyed to shaft 18 around which passes a belt 24 engaging a smaller pulley 25 keyed to the saw shaft 22. In order to maintain said belt 24 taut, an idler pulley 26, journaled at the lower end of a swinging bracket 27 is forced against said belt 24; by means of a 00111131158- sion spring 28 surrounding a tie bolt 29 which passes loosely through the lower end of said bracket arm 27. A pedal 80 rigid with and extending forwardly from the lower end of frame 20 enables the saw to be swung forwardly into the dotted line position 31 shown in Fig. 1. A counterweight 32 carried by a rearwardly extending arm 88 rigid with the frame 20 normally causes the saw frame 20 to assume the full line po- 9 sition shown in Fig. 1, a suitable stop 34 which is engaged by the pedal preventing the saw from swinging too far back.

The jig or work holder takes the form of a V-shaped casting, the arms 35 and 36 of which are connected at their outer ends by a yoke piece 37. Said yoke piece 37 rests and slides upon the upper surface of a work table 38 formed as a part of the supporting standard 16. The point of the V-sha'ped. work holder is pivoted on a pin or bolt 39' mounted in and extending through an aper ture in a horizontally extending bracket 40 bolted to the front of said table 38.

As shown in Figs. 2 and 4, the yoke piece 37 is shaped to provide a pair of rabbets 41 and 42 to acconunodate and position the members 10 and 12, said rabbets extending at right angles to each other so that the parts 10 and 12 when igged occupy the same position relative to each other as they will assume when secured together in the completed structure. In order to hold said arts 10 and 12 in their respective rabbets 41 and 42, I employ a pair of clamps, one of which is shown in Fig. 4t. Said clamp ineludes a small slotted bar having a depending lug let at one end which engages behind the outer edge of tube 10 and having at its other end a depending lug e5 which engages behind an upstanding lug 46011 the upper surface of yoke 37. Said clamp bar l3 is held down by a stud 4:7 mounted in the yoke 37 extending through the slot 48 in said clamp 43 and provided at its upper end with a wing nut 49.

The corner piece 11 is positioned on the work holder so that its ends 50 and 51. overlap the extremities 52 and of the parts 10 and 12 respectively. Hence said corner piece 11 will lie in a horizontal plane offset or spaced from the horizontal plane occupied by the parts 10 and 12. In order to support said corner piece 11 in its offset position, the yoke piece 37' is made with an elevation 54: which is higher or thicker than the bottom of rabbet ll by an amount equal to the height or thickness of the members 10 and 12.

As to its projected position perpendicular to the plane in which the parts 10 and 12 are located. the corner piece 11 is located by a pair of pins or studs 55 and 56 projecting from the upper surface of the elevation 54-. Said corner piece 11 is also held down by a clamp 57 clamping stud 58 and wing nut 59, similar to the parts used for clamping down the piece 10 and 12. However, in the case of the clamping bar 57, the lug 60 is made with a bevel or ram surface which cooperates with a bevel face on the upstanding lug 61 so as to cause the lug 62 of said cl amp 57 to draw the corner piece 11. in firm on gagement with the stop pins and 56 when the wing nut 59 is tightened.

The work holder is arranged so that the line or perpendicular plane passing through the intersections of the outer and inner boundaries of the miter members will also pass through the axis of pivot 39 and coin eide with the plane of the saw 63 on shaft To locate said work holder in its correct angular position, I employ a pair of stop lugs 64 and 65 projecting from the upper surface of the table 38 and cooperating with adjustable set screws 66 and 67 respectively mounted in the arms 35 and 36 respectively of the ll-shaped work holder. The work holder is slotted as shown at (58 and 69 in order to provide clearance for the saw.

In view of the above description, the operation of the apparatus will be manifest to those skilled in the art. After the parts 10, 11 and 12 have been jigged in the manner shown in Fig. 2, the work holder is held in position so that set screw 66 engages stop 64 and then the pedal 30 is depressed, causing the rotating saw 63 to sweep through and cut off the ends 50 and 52 at the required angle. The pedal is then released, the saw permitted to drop back and then the work holder is swung to the left causing the end of screw 67 to impinge against stop 65, when the pedal is again depressed. 'lhis effects severance of the extremities 53 and 51. The parts are then removed from the and when the time comes for assembly they are put back in the same relative position as they occupied in the work holder, but in the same horizontal plane instead of in offset horizontal planes as in the The actual joint may be made by brazing or welding, and in this connection, although I speak of the parts being placed with their sawn edges in abutting engagement, the phrase in abutting engagement is intended to include a slight spacing of the edges which may be desirable for the purpose of permitting the spelter or welding metal properly to flow into the joint.

The described details of operation and construction being illustrative of one phase only of my invention, it will be understood that the scope of same should be determined by reference to the appended claim, said claim being construed as broadly as possible, consistent with the state of the art.

I claim as my invention:

Apparatus for cutting the ends of three lengths which are to be mitered together which comprises awork holder, means for holding the two outer lengths on said work holder in a common plane, means for holding the intermediate length in a plane parallel with the first plane. but offset to permit the ends of said intermediate length to over-- lap the adjacent ends of the other lengths, saw means and means for effecting an operative movement of said saw through the in tersections of said overlapping ends, the arrangement including means for swinging said work holder in said first mentioned plane relative to said saw means in order to engage said saw with first one of the miter joint intersections and then the other miter joint intersection.

FRANK KUSTERLE. 

